Lag And Qos Policies - Alcatel-Lucent 7210 SAS E OS Configuration Manual

LAG

LAG and QoS Policies

In the 7210 SAS E, an ingress QoS policy is applied to the aggregate traffic that enters the traffic
through all the ports of the system. For example, if an ingress policy is configured with a policier
of PIR 100Mb, for a SAP configured on a LAG with two ports, then the policer limits the traffic
entering the system through the two ports to a maximum of 100Mb.
In the 7210 SAS E, egress QoS policy shaper parameters are applied to all the ports that are
members of the LAG (all ports get the full SLA). For example, if an egress policy is configured
with a policer of PIR 100Mb, each port would get a PIR of 100 Mb. The advantage of this method
over a scheme where the PIR is divided equally among all the member ports of the LAG, is that a
single flow can consume the entire SLA. The disadvantage is that the overall SLA can be exceeded
if the flows span multiple ports.
Page 32 7210 SAS E Interface Configuration Guide